#headDiv{
    height: 50px;
    border: 1px solid;
}
#leftDiv{
    width: 15%;
    height: 640px;
    border: 1px solid;
    float: left;
}
#mainDiv{
    border: 1px solid;
    height: 640px;
}
#buttomDiv{
    border: 1px solid;
    height: 20px;
}